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Optical control of magnetism in semiconductors in the ultrafast time scale

Grant number: 16/24125-5
Support type:Regular Research Grants
Duration: April 01, 2017 - March 31, 2019
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Andre Bohomoletz Henriques
Grantee:Andre Bohomoletz Henriques
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Changing the magnetic state of matter at will and in the ultrashort time scale is a subject of vast contemporary interest. In this project we shall investigate the optical control of magnetism in a variety of semiconductor materials. Light will be used both to induce as well as to monitor the magnetic state. We shall investigate the steady magnetism, as well as the transient one, using optical pulses, with a time resolution in the femtosecond scale. The materials to be investigated are (1) intrinsic magnetic semiconductors (EuO, EuSe and EuTe); (2) negatively charged InGaAs/GaAs quantum dots; (3) mixed cation organic-inorganic perovskites, which is a strategic material for solar cell applications. All samples will be supplied by the best specialists worldwide (UNICAMP, INPE, Ioffe/Russia, Linz/Austria and Eindhoven/The Netherlands). Experiments will be performed at he Magneto-Optics Laboratory, at the University of Sao Paulo. In this project, funds are requested for consumables, for a laser modulator required for some of the time resolved experiments, and for support of a three months visit of a scientist from Ioffe, who will participate in the experiments and interpretations. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VAN KOOTEN, S. C. P.; USACHEV, P. A.; GRATENS, X.; NAUPA, A. R.; CHITTA, V. A.; SPRINGHOLZ, G.; HENRIQUES, A. B.. Converting Faraday rotation into magnetization in europium chalcogenides. Journal of Applied Physics, v. 126, n. 9, . (16/24125-5)
HENRIQUES, A. B.; USACHEV, P. A.. Faraday rotation by the undisturbed bulk and by photoinduced giant polarons in EuTe. Physical Review B, v. 96, n. 19, . (16/24125-5)

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